We parked on the street and Dad and I took a quick walk through a very busy part of town to search for the bench mark disk set vertically into the gate at the base of a long stone stairway leading uphill toward Lafayette College. The disk is in excellent condition. A plaque in the opposite face of the gate explains that the stones came from Traill Green Observatory, a gift of Dr. Traill Green. The observatory was razed in 1928.

A report on the condition of this survey mark has been submitted to NGS.

NGS Bench Mark Disk GATEThe disk is set in the west face of the east stone pillar.Dad approaches the gate from the south.A plaque on the opposite face explains the origin of the stones.